Multitail lets you view one or multiple files like
the original tail program. The difference is that
it creates multiple windows on your console
(with ncurses). It can also use colors while
displaying the logfiles, for faster recognition of
which lines are important and which are not. It
supports regular expressions. It has
interactive menus for editing
given regular expressions and deleting and
adding windows.
You can also monitor the output of external
commands. For example: the output of "netstat
-t". It is then also possible to only show the
difference of output.